SITE INFORMATION AND CORRESPONDENCE

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• a STATE OF CALIFORNIA- Environmental Protection Agency PETE WILSON, Govemor CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD „- CENTRAL VALLEY REGION pl r I4,L HEA l_Ttf 3443 Routier Road, Suite A _ Q, Sacramento, CA 3096 911 OCT 20 Pig 1 t 40 8 PHONE: (916)255-3005-300 0 FAX: (916)255-3015 - - - 19 October 1994 Mr. Paul Sundberg Roy F. Weston, Inc. 83 West March Lane, Suite 12 Stockton, CA 95207 EXTENSION OF WORKPLAN DUE DATE, KOPPEL STOCKTON TERMINAL Your 4 October 1994 request to extend the investigation workplan submittal date to 1 November 1994 is approved. This correspondence documents previous approval which was given in a 12 October telephone conversation with Karla Brasaemle of your staff. In that phone call, we discussed the number of ground water monitoring wells that the Regional Board would normally require. I stated that a minimum of three wells should be installed, so that triangulation could be used to determine the ground water gradient. This requirement applies particularly for the subject project, since our goal is to compare data generated to data already collected at the PM Ag (Unocal) and Cal-Farm Supply sites, so that the ground water hydrology of the Port of Stockton area can be better understood. Yesterday, David Marks of your staff was in our office reviewing files in connection with the Koppel site. It is my understanding that Mr. Marks will be the project manager, and we talked about the above issues. Also, I brought up the point that when the new monitoring wells are surveyed, they need to be tied into the same monuments or benchmarks that were used for the PM Ag site. The consultant for that site is John Rapp of Sierra-Pacific Groundwater Consultants. He can be reached at (916) 933-1468. I am still researching the surveying details for the Cal-Farm Supply site. For your information, the consultant for that project is Kelye McKinney of Kennedy/Jenks Consultants, and she can be reached at (916) 362-3251. Thank you for your attention to the above matters. I look forward to working with you and David until early next year, at which time Wendy Wyels is scheduled to return to the office. If you have any/q�uestio�ns or concerns, please telephone me at (916) 255-3103. CHRISTINE M. HOLM Agricultural Regulatory Unit cc: Mr. John Rapp, Sierra-Pacific Groundwater Consultants, El Dorado Hills Ms. Kelye McKinney, Kennedy/Jenks Consultants, Sacramento VMS. Diane Hinson, San Joaquin County Public Health Services, Stockton